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Avoid using-directives in the global scope in headers #3326

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Avoid using-directives in the global scope in headers#3326
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vkuceradsekihat
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enhancementNew feature or requesthelp wantedExtra attention is needed

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@vkucera
vkucera
opened on Aug 15, 2023

Using-directives should never appear in the global scope in headers because they irreversibly pollute the global namespace wherever they are included and can lead to unexpected behaviour, such as name conflicts. See O2 CodingGuidelines, C++ Core Guidelines.

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  1. vkucera
    assigned
    vkucera
    and
    ddobrigk
    on Aug 15, 2023

  2. vkucera commented on Aug 15, 2023

    @vkucera
    vkucera
    on Aug 15, 2023
    CollaboratorAuthor

    Fixed non-PWG directories

  3. vkucera commented on Sep 1, 2023

    @vkucera
    vkucera
    on Sep 1, 2023
    CollaboratorAuthor

  4. vkucera commented on Oct 14, 2023

    @vkucera
    vkucera
    on Oct 14, 2023
    CollaboratorAuthor
  5. vkucera
    pinned this issue on Apr 11, 2024

  6. vkucera commented on Aug 1, 2024

    @vkucera
    vkucera
    on Aug 1, 2024
    CollaboratorAuthor

    Test implemented in:

  7. vkucera
    added
    enhancementNew feature or request
    on Oct 18, 2024
  8. vkucera
    added
    help wantedExtra attention is needed
    on Nov 8, 2024
  9. vkucera
    changed the title [-]Avoid using-directives in headers[/-] [+]Avoid using-directives in the global scope in headers[/+] on Jan 22, 2025
  10. github-actions
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  11. github-actions
    closed this as not plannedon Apr 7, 2025
  12. vkucera
    removed
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    on Apr 7, 2025
  13. vkucera
    reopened this on Apr 7, 2025
  14. github-actions
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  15. github-actions
    closed this as not plannedon Aug 29, 2025
  16. vkucera
    reopened this on Sep 2, 2025
  17. vkucera
    removed
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    on Sep 2, 2025

  18. vkucera commented on Sep 3, 2025

    @vkucera
    vkucera
    on Sep 3, 2025
    CollaboratorAuthor
  19. github-actions
    added
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    on Oct 4, 2025
  20. vkucera
    removed
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    on Oct 8, 2025
  21. github-actions
    added
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  22. github-actions
    closed this as not plannedon Nov 13, 2025
  23. vkucera
    reopened this on Nov 13, 2025
  24. github-actions
    removed
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    on Nov 14, 2025
  25. vkucera
    assigned
    dsekihat
    and unassigned
    ddobrigk
    on Mar 9, 2026

  26. vkucera commented on Mar 26, 2026

    @vkucera
    vkucera
    on Mar 26, 2026
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